Edward h



'(No Modl.)

- E. H. JOHNSON.

ELEGTRIG CURRENT REGULATOR.

Patented Sept; 2,,

tion.

, apparatus is designed particularly for use in 'device's'and combinations, as fully hereinafter coupled therewith. It carries a slidiugclutch- UNITE STATES 1 EDWARD HLJoHNsoN,

PATENT O FICE),

on NEW YORK, N. Y.

ELECTRIC-CU RRENT- REGU LATO R.

srncmcarxon forming part orwmrmne-m 435,899, dated September 1890.

Application filed October 19, 1887- The object of my invention is to produce a simple and efficient apparatus for adjusting a resistance or other electric current-vaiying device, which may be the resistance in the field-circuit of a dynamo-electric machine or in a feeder of a light or power system. The

connection with multiple-arc systems or circuits. It overcomes to a great extent the finctuations back and forth which are incident to the operation of apparatus heretofore em ployed for this purpose.

The invention consistsiuthe several-novel explained, and pointed out by the claims.

In the accompanying drawings, forming a part hereof, Figure l is a view principally in diagram of an apparatus embodying my invention, and Fig. 2 a view, on a larger scale, illustrating in particular the devices for disconnecting the resistance adjusting wheel from the operating electric motor.

The resistance R is adapted to be thrown into and out of the circuit 1 2, which may be the field-circuit of a dynamo-elcctric machine supplying current to the circuit 3 4, or it may be a feeding-circuit of a system of which the circuit 3 4 is a part. The resistance-adjusting arm A is fixed to a shaft carrying awormwheel B. This worm-wheel engages with and is driven by a worm C, which is sleeved to turn loosely on the shaft D. The shaft D is the shaft of the motor armature E or is sleeve D which engages the worm O and looks it to the shaft when it is drawn against said worm.

F is an electro-magnet whose armature G engages by a fork the sliding clutch sleeve. This armature is retracted by a spring a, so that when the magnet F is not energized the spring a will draw the armature and clutchsleeve back and disconnect the Work from the motor-shaft, while the attraction of the arma- Serial No. 263,803. (No modohl ture G by the magnet F will lock the worm to thelmotor-shaftand cause it to turn therewith. v

The field-magnet H of the motor is provided 5 5 I with reverse windings b c, a current passing through one winding causing the motor to run in one, direction, while a current through the other winding causes it to run in the opposite direction.

I is the controlling-pressure magnet connectedin multiple arc wit-hthe conductors 3 4. Its armature K'is balanced between the attractive force of the magnet and the retractive force of the spring at when the pressure is normal. Centering-springs e tend to keep the armature K in a central position, as will be well understood, and out of contact with the front and back limit-stops f g.

The circuit-connections for controlling the i motor and the magnet F are as follows: From conductor 3 of the multiple-arc system or circuit by wire 5 to the controlling-armature K. At the limit-stops f g the circuit is divided,

the wire 6-from the front stop f running to the winding 1) of the motor field-maget,while the wire 7 from the back stop 9 runs to the reverse winding 0. On the other side of the windings b c the circuit unites into one part 8, which runs through the motor-armature and the magnet F back to the other conductor 4 of the multiple-arc system or circuit. Now it will be seen that when the armature K touches either stop f or g. the circuit through the motor and the clutch-magnet will be closed, and the motor will run in one direction or the other, according to which limitstop is touched, while the clutch-magnet will connect the worm with the motor-shaft and the resistance will be adjusimi. As soon as the armature of the pressure-magi'iet leaves the limit-stop and resumes its central or balanced position the clutch-magnet will release its armature, which will be drawn back by its retracting-spring, and the worm will thereby be discounected from the motor-shaft, preventing the further movement which the motor will be given, by reason of its acquired momentum, from carrying the resistance-adjusting arm with it. Thus the fluctuations incident to apparatus heretofore employed will be avoided. To absorb the spark,wl1ich tween the motor-shaft D and the resistanceadjusting arm A will be so proportioned relative tothe speed of the motor and the rate of magnetic charge and discharge'of the fieldmagnet of the dynamo to be regulated that the resistance will be introduced into or cut out of the field-circuit of such dynamo Ma rate to which such field-magnet can readily respond. Hence the fluctuations caused by introducing or cutting out an excessive amount of resistance due to the working of the regulator at a greater rate than the rate of magnetic charge and discharge of the dynamo field-magnet will be obviated.

What I claim is- 1. In an electric-current regulator, theco'n'v. bination, with a. pressure-magnet, of an electric motor controlled thereby,a current-vary ing device operated "by-such motor, and a clutch-magnet also controlled by the pressuremagnet and acting to connect and disconnect the motor and the current-varying device,-

substantially as set forth.

2. In an electric-current regulator, the'combination, with a pressure-magnet, its armatn re, and limit-stops,ot an, electric inotor having device operated in one direction or the other bysuch motor under the control of such pressurc-magnet, and a clutch-magnet located in circuit with the motor and acting to connect and disconnect the motor and .the current-varying device, substantially as set forth. v 40 3; In an electric-current regulator, the combination, with the controlling pressure-magnet and the operating electricmotor, of the worm sleeved on the motor-shaft, the wormwheel connected with a resistance-adjusting arm, the clutch-magnet, and the clutch-sleeve sliding on the motor-shaft and moved by the clutch-magnet to'eonnect and disconnect such shaft and the worm sleeved thereon, shbstahtially as set forth.- j

4. In an electric-current regulator; the combination, with-the controlling pressure-magnet and its lever and-limit-stops, of the EH30,

tric motor having reverse field-windings controlled at such liinit sto'ps' and connected with and operating a resistance-adjusting arm,v and a shunt or high resistance con heating said limit-stops, substantially as set forth, This'speciflcation signed and witnessed this 5th day of October, 1887-.

EDWD. H. JOHNSON. Witnesses: WILLIAM Pnnznn, E. O. ROWLAND. 

